minify.json.js

/*! JSON.minify()
	v0.1 (c) Kyle Simpson
	MIT License
*/

(function(global){
	if (typeof global.JSON == "undefined" || !global.JSON) {
		global.JSON = {};
	}
	
	global.JSON.minify = function(json) {
		
		var tokenizer = /"|(\/\*)|(\*\/)|(\/\/)|\n|\r/g,
			in_string = false,
			in_multiline_comment = false,
			in_singleline_comment = false,
			tmp, tmp2, new_str = [], ns = 0, from = 0, lc, rc
		;
		
		tokenizer.lastIndex = 0;
		
		while (tmp = tokenizer.exec(json)) {
			lc = RegExp.leftContext;
			rc = RegExp.rightContext;
			if (!in_multiline_comment && !in_singleline_comment) {
				tmp2 = lc.substring(from);
				if (!in_string) {
					tmp2 = tmp2.replace(/(\n|\r|\s)*/g,"");
				}
				new_str[ns++] = tmp2;
			}
			from = tokenizer.lastIndex;
			
			if (tmp[0] == "\"" && !in_multiline_comment && !in_singleline_comment) {
				tmp2 = lc.match(/(\\)*$/);
				if (!in_string || !tmp2 || (tmp2[0].length % 2) == 0) {	// start of string with ", or unescaped " character found to end string
					in_string = !in_string;
				}
				from--; // include " character in next catch
				rc = json.substring(from);
			}
			else if (tmp[0] == "/*" && !in_string && !in_multiline_comment && !in_singleline_comment) {
				in_multiline_comment = true;
			}
			else if (tmp[0] == "*/" && !in_string && in_multiline_comment && !in_singleline_comment) {
				in_multiline_comment = false;
			}
			else if (tmp[0] == "//" && !in_string && !in_multiline_comment && !in_singleline_comment) {
				in_singleline_comment = true;
			}
			else if ((tmp[0] == "\n" || tmp[0] == "\r") && !in_string && !in_multiline_comment && in_singleline_comment) {
				in_singleline_comment = false;
			}
			else if (!in_multiline_comment && !in_singleline_comment && !(/\n|\r|\s/.test(tmp[0]))) {
				new_str[ns++] = tmp[0];
			}
		}
		new_str[ns++] = rc;
		return new_str.join("");
	};
})(this);